I’ve tried to keep up with all the great discussions recently on grid cells, but if what I’m asking here has already been covered then please link me. Also as this is active research, I welcome the usual high quality speculation I’ve come to expect from this forum
So, I think I understand how locations are unique to each environment, where the discussion is usually framed around the presence of objects (coffee cups, pens and staplers).
I’ve been pondering on how the lack of an object is represented in the grid cell theory and thousand brains model. So in the scenario of reaching into a cardboard box to touch a coffee cup (assume a large box), this is the question of what’s happening as your hand searches the empty space for the cup. If you sweep the area systematically, your brain must be constructing a map containing no objects, thus if you revisit old empty space then your brain will expect your hand to touch nothing.
Is it believed that the empty spaces in the box are learned as models by cortical columns, the same as the coffee cup is?